Padlock.



A. NERHAPT.

PADLOGK. APPLICATION FILED fBB.,19oa.

957/3705. Patented may 1o, 1910.

j u staf-ras BEST AVAILABLE COPY ANTON NERHAFT, OF BUDAPEST,AUSTRIA-HUNGARY.

PADLOCK.

Specification of Letters Patent.

Application filed February 8, 1908.

Serial No. 414,953.

vertical section showing the movable plates:

in position when the shackle is withdrawn: Fig. 2 a horizontal sectionof one form of the improvedlock. Fig. 3 shows the key for the same: Fig.4 shows the shackle in side elevation: Fig. 5 is an end view of thesame: Fig. 6 shows a base plate in plan and elevation: Fig. 7 shows alocking plate in plan and elevation: Figs. 8 and 9 show a modifiedconstruction of the lock and the key.

In the casing 2 of the padlock, arranged in a preferably oval case 1 arearranged movable locking plates 3 shown in Fig. 7 lo cated one aboveanother and separated from one another by fixed plates 4. The plates 3are arranged on the plates 4 in such manner that the shoulders 5 of thelocking plates engage with projections 6 on the plates 4 (Fig. 2) in themanner hereinafter described. The plates 4 are provided with circularapertures 8 for guiding the two ends of the shackle 7. Each plate 3 hasa longitudinal slot 9 which at the places where the shackle 7 passesthrough has segmental parts 10 cut out corresponding to the size of theshackle. The longitudinal slots 9 are of uniform length in the variousplates but in each plate are not symmetrical about the central line A-B(Fig. 7) but are transposed or staggered either to the right or to theleft of the same. If, therefore, the various plates 3 are arranged oneabove another the slots 10 will not be in register (Fig. 1) In order tobring the slots 10 into register the plates 3 must be shifted inhorizontal planes so that the transversemedian line of the plate doesnot coincide with the transverse median line of the slot. On the shackle7 which is of the same diameter as the slot 10 notches 11 are providedon both sides (Figs. 4 and 5) so that the plates or the inner edges ofthe slots 9 engage the notches 11 and prevent the withdrawal of theshackle. lVhen the plates 3 are in a position in which the perforations10 and 8 are in register the shackle 7 can be its free end a lug 19.

freely inserted. In order to move the plates 3 into this position a key12 is used the bitsI 13 of which are of a length corresponding tcPatented May 10, 1910. A

the desired movement. When this key is i."

.serted through the opening 14 in the casing 1 the bits 13 come againstthe plates 3 corl responding to the same and move the samel back untilthe key body comes against the plates 4. Thus the shackle 7 canbeinse'rted` in the lock. Each of the locking plates is' provided withspiral springs 16 bearing at one end on the projections 6 on the plates4 and at the other end on the shoulders 15 or the plates 3. If the keyis withdrawn the springs 16 shift the plates 3 so far that the shoulders5 coincide with the projections on the plates 4. The free movement ofthe plates under the action of the spiral spring 16 is not prevented bythe shackle l7' as the same is provided with notches 11. The withdrawalof the shackle is however prevented by the inner edges 17 of the slots 9which as mentioned engage the notches in the shackle.

Fig. 8 shows a modied form in which the@ to the bottom of the casing ishollow and contains in its bore a helical spring 204 If the key isinserted it moves the locking plates into the correct position and th(`shackle 7 is released and the compressedy spring 20 raises the same outof the lockl casing. In order to prevent complete re-f moval of theshackle, the under end of the same is provided with a flange 22.4 Inorde] to retain the key in the key hole after its insertion under thelast of the plates 4 2 blade spring 18 is arranged which has or The keyshown ir Fig. 9 has also a lug 21. When the key has been inserted andthe shackle has beer withdrawn the spring 18, previously de pressed bythe shackle is released and en gages with its lug 19 behind the lug 21o1 the key and prevents the same from falling out, the locking platesbeing held in posi tion. If the shackle is inserted its end de pressesthe spring 18, the key isreleased an( purpose i?" is pressed out by theplates 3 returning intr key. The combinations are given by altering thenumber of locking plates and the position of the slots 9.

Having described my invention what I claim and desire to secure byLetters Patent of the United States is l. In a safety lock thecombination with a casing of a shackle attached to said casing saidshackle being formed with notches, fixed plates secured in the interiorof said casing, movable plates interposed between said fixed plates,said xed plates being `-rmed with orifices and said movable plateshaving orifices out of line with each other and connected by slots, saidorifices serving to receive said shackle, said movable plates adapted tobe moved longitudinally in one direction through varying distances underthe action of a key, and a spring tending to move the movable plates inthe opposite direct-ion.

2. In a safety lock the combination of a casing, of fixed plates mountedin said cas ing and formed with oriiices, movable plates interposedbetween said fixed plates and formed with orifices out of line with eachother and connected by slots, a tubular shackle one shank of which isshorter than the other, a helical spring mounted in the longer limb ofthe shackle and interposed between the same and the casing, and a bladespring fitted below the plates and provided with a lug adapted to beengagedby a lug on the key, as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ANTGN NERHAFT.

Witnesses:

. ERNEST MILLER,

THEO. A. GAsoUoHI.

BEST Mamani COPY

